<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="发布课程"/>
    </el-steps>

    <el-button type="text" @click="dialogChapterFormVisible = true">添加章节</el-button>

<!-- 章节 -->
<ul class="chanpterList">
    <li
        v-for="chapter in chapterVideoList"
        :key="chapter.id">
        <p>
            {{ chapter.title }}

            <span class="acts">
                <el-button type="text" @click="openVideo(chapter.id)">添加课时</el-button>
                <el-button style="" type="text" @click="editChapter(chapter.id)">编辑</el-button>
                <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
            </span>
        </p>

        <!-- 视频 -->
        <ul class="chanpterList videoList">
            <li
                v-for="video in chapter.children"
                :key="video.id">
                <p>{{ video.title }}
                    <span class="acts">
                        <el-button type="text" @click="editVideo(video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                    </span>
                </p>
            </li>
        </ul>
    </li>
</ul>

<!-- 添加和修改章节表单 -->
<el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
    <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
    </div>
</el-dialog>

<!-- 添加和修改课时表单 -->
<el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
  <el-form :model="video" label-width="120px">
    <el-form-item label="课时标题">
      <el-input v-model="video.title"/>
    </el-form-item>
    <el-form-item label="课时排序">
      <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
    </el-form-item>
    <el-form-item label="是否免费">
      <el-radio-group v-model="video.free">
        <el-radio :label="true">免费</el-radio>
        <el-radio :label="false">默认</el-radio>
      </el-radio-group>
    </el-form-item>

    <el-form-item label="上传视频">
        <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/vod/video/upload'"
              :limit="1"
              class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
    </el-form-item>

  </el-form>
  <div slot="footer" class="dialog-footer">
    <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
    <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
  </div>
</el-dialog>

<div>
    <el-button @click="previous">上一步</el-button>
    <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
</div>
  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseId: '',
      chapterVideoList: [],
      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      chapter: {},
      video: {},
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },

  created() {
    if(this.$route.params && this.$route.params.id){
        this.courseId = this.$route.params.id
        this.getChapterVideo()
    }
  },

  methods: {
    //=================视频管理============
    //成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    //删除之前确认操作
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`)
    },
    //确定删除
    handleVodRemove(file, fileList){
      video.deleteVideo(this.video.videoSourceId).then(res=>{
        this.$message.success("视频删除成功")
        //清空数据
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
        this.fileList=[]
      })
    },

    //=================小节管理============
    //删除小节
    removeVideo(id){
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return video.delete(id)
      }).then(() => {
        this.getChapterVideo()// 刷新列表
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
      }).catch((response) => { // 失败
        if (response === 'cancel') {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })
        } else {
          this.$message({
            type: 'error',
            message: response.message
          })
        }
      })
    },

    //编辑小节
    editVideo(id){
      this.dialogVideoFormVisible = true //弹出对话框
      video.getById(id).then(res=>{
        this.video = res.data.item
      })
    },

    //点击新增小节打开对话框
    openVideo(chapterId){
      this.dialogVideoFormVisible = true

      this.video.chapterId = chapterId
    },

    saveOrUpdateVideo(){
      if(!this.video.id){
        this.saveVideo();
      }else{
        this.updateVideo();
      }
    },

    saveVideo(){
      this.video.courseId = this.courseId
      video.save(this.video).then(res=>{
        //消息提示
        this.$message.success("新增小节成功")
        this.helpVideo()
      })
    },

    //更新
    updateVideo(){
      video.update(this.video).then(res=>{
        //消息提示
        this.$message.success("更新小节成功")
        this.helpVideo()
      })
    },

    helpVideo(){
        this.dialogVideoFormVisible = false// 如果保存成功则关闭对话框
        this.getChapterVideo()// 刷新列表
        this.video.title = ''// 重置章节标题
        this.video.sort = 0// 重置章节标题
        this.video.videoSourceId = ''// 重置视频资源id
        this.saveVideoBtnDisabled = false
        //清空视频数据
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
        this.fileList=[]
    },


    //=================章节管理============
    saveOrUpdate(){
      if(!this.chapter.id){
        this.save();
      }else{
        this.update();
      }

    },
    //新增
    save(){
      //补全chapter
      this.chapter.courseId = this.courseId
      chapter.save(this.chapter).then(res=>{
        //消息提示
        this.$message.success("新增章节成功")
        this.helpSave()
      })
    },
    //更新
    update(){
      chapter.update(this.chapter).then(res=>{
        //消息提示
        this.$message.success("更新章节成功")
        this.helpSave()
      })
    },
    helpSave(){
      this.dialogChapterFormVisible = false //关闭对话框
      this.getChapterVideo()// 刷新列表
      this.chapter.title = ''// 重置章节标题
      this.chapter.sort = 0// 重置章节标题
      this.saveBtnDisabled = false
    },

    //编辑章节
    editChapter(id){
      this.dialogChapterFormVisible = true //弹出对话框
      chapter.getById(id).then(res=>{
        this.chapter = res.data.item
      })
    },

    //删除章节
    removeChapter(id){
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return chapter.delete(id)
      }).then(() => {
        this.getChapterVideo()// 刷新列表
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
      }).catch((response) => { // 失败
        if (response === 'cancel') {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })
        } else {
          this.$message({
            type: 'error',
            message: response.message
          })
        }
      })
    },

    getChapterVideo(){
          chapter.getListByCourseId(this.courseId).then(res => {
              this.chapterVideoList = res.data.items
          })
      },

    previous() {
      this.$router.push({ path: '/edu/course/info/'+this.courseId })
    },

    next() {
      this.$router.push({ path: '/edu/course/publish/'+this.courseId })
    }
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>